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【单选题】
以下关于阴道发育异常描述不正确的是A.
先天性无阴道几乎均合并无子宫或仅有始基子宫，但有正常卵巢和输卵管
B.
阴道闭锁段多位于阴道下段
C.
阴道横隔以阴道上、中段交界处为多见
D.
若系分娩时发现阴道横隔阻碍胎先露部下降均剖宫产
E.
绝大多数阴道纵隔患者无症状
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【单选题】Medium-speed engines have the following advantages except____.
A.
medium-speed engines use less oil than slow-speed engines.
B.
medium-speed engines of later type are capable of burning low quality heavy fuel oil.
C.
the engines have long stroke which improve engine efficiency.
D.
the engines are compact, thus providing more spaces for cargoes and passengers.
【单选题】Medium speed engines have the following advantages except _______.
A.
medium speed engines use less oil than slow speed engines.
B.
Medium speed engines of later type are capable of burning low quality heavy fuel oil.
C.
The engines have long strokes which improve engine efficiency
D.
The engines are compact. Thus providing more spaces for cargoes and passengers.
【单选题】Medium-speed engines have the following advantages except
A.
medium-speed engines use less oil than slow-speed engines
B.
medium-speed engines of later type are capable of burning low quality heavy fuel oil
C.
the engines have long strokes which improve engine efficiency
D.
the engines are compact， thus providing more spaces for cargoes and passengers
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